CompTIA
SG0-001 · Question #414
SG0-001 Question #414: Real Exam Question with Answer & Explanation
The correct answer is A. 40. To ensure fair and optimal distribution of I/O operations and prevent resource contention, the HBA queue depth should be set by dividing the storage port's maximum queue depth by the number of HBAs sharing that port.
Storage Implementation
Question
When setting up queue depths in the below environment parameters: - A storage device's port queue depth setting is set to 160 - They would like to assign 4 host HBAs to each port Which of the following depth values would be the BEST to assign to each HBA?
Options
- A40
- B80
- C160+
- DDefault value
Explanation
To ensure fair and optimal distribution of I/O operations and prevent resource contention, the HBA queue depth should be set by dividing the storage port's maximum queue depth by the number of HBAs sharing that port.
Common mistakes.
- B. Setting the HBA queue depth to 80 would mean that the four HBAs could collectively request 320 I/O operations (4 * 80) at once, which is double the storage port's capacity of 160, leading to severe contention and performance degradation.
- C. A queue depth of 160+ for each HBA is excessively high, as even one HBA would saturate the storage port, and multiple HBAs would create extreme congestion, leading to very poor performance.
- D. Relying on the default value for HBA queue depth is often not optimal, as defaults are generic and do not account for specific environmental parameters like shared storage ports, potentially leading to performance bottlenecks or instability.
Concept tested. HBA queue depth configuration for shared storage
Topics
#queue depth#HBA configuration#performance tuning#storage connectivity
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